||1948|1952|1956|1960|1964|
|---|---|---|---|---|---|
|all voters|50|45|42|50|61|
|White|50|43|41|49|59|
|Black|50|79|61|68|94|
|College educated|22|34|31|39|52|
|High School educated|51|45|42|52|62|
|Grade School educated|64|52|50|55|66|
|Professional & Business|19|36|32|42|54|
|White Collar|47|40|37|48|57|
|Manual worker|66|55|50|60|71|
|Farmer|60|33|46|48|53|
|Union member|76||51|62|77|
|Not union|42||35|44|56|
|Protestant|43|37|37|38|55|
|Catholic|62|56|51|78|76|
|Republican||8|4|5|20|
|Independent||35|30|43|56|
|Democrat||77|85|84|87|
|East|48|45|40|53|68|
|Midwest|50|42|41|48|61|
|West|49|42|43|49|60|
|South|53|51|49|51|52|

Question: how many groups are listed in the year 1948?
Answer: 17